Definition

CAC (Customer Acquisition Cost) = the average cost of acquiring one new customer.

It measures how much you spend on sales & marketing to bring in a paying customer.

$CAC = \frac{\text{Total Sales + Marketing Costs}}{\text{Number of New Customers Acquired}}$

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What’s Included in CAC?

• Marketing spend (ads, campaigns, events, content).
• Sales team costs (salaries, commissions, software).
• Tools & infrastructure (CRM, email automation, lead-gen software).
• Onboarding & promotions (discounts, referral bonuses, trial costs).

The exact definition can vary depending on whether you use blended CAC (all spend / all customers) or channel-specific CAC (cost per channel).

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Example

Suppose in Q1:

• Marketing + Sales spend = $500,000
• New customers acquired = 2,000

$CAC = \frac{500,000}{2000} = \$250$

It costs $250 on average to acquire each new customer.

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Why CAC Matters

• Unit economics: CAC must be sustainable relative to LTV (Customer Lifetime Value).
• Profitability rule of thumb:
  • LTV / CAC ratio should be ≥ 3:1 (healthy).
  • If < 1:1 → losing money on every customer.
• Budget allocation: Compare CAC across channels (Facebook ads vs Google ads vs referrals).
• Scalability: High CAC may limit growth if marginal acquisition gets too expensive.

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Related Variants

• Blended CAC = total spend ÷ all new customers.
• Paid CAC = paid marketing spend ÷ new paid customers.
• Organic CAC = content/SEO/social spend ÷ new organic customers.
• Fully loaded CAC = includes salaries, overhead, tools.

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Improving CAC

• Better targeting (reduce wasted ad spend).
• Conversion funnel optimization (higher CR = lower CAC).
• Retention focus (higher LTV makes CAC more sustainable).
• Channel diversification (shift to lower-CAC channels like referrals, SEO).

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Summary

• CAC = cost per acquired customer.
• Key for growth, unit economics, and investor metrics.
• Must be considered alongside LTV for profitability.